Despite the remarkable advancements in the additive manufacturing of metamaterials, tradeoffs remain between functionality and mechanical performance owning to static configuration, which limits their application, particularly in areas that require efficient multifunctionality. In this paper, we present a novel approach for fabricating multifunctional smart flexible metal metamaterials using laser powder bed fusion technology. This approach enables the reversible recovery superelastic strain exceeding 20 % with a 100 % recovery rate—ten times higher than that observed in the printed alloy. This is achieved by utilising an innovative metamaterial structural design and a novel shape memory alloy powder. To achieve the aforementioned purpose, the metamaterial unit cells were initially designed to ensure flexible deformation ability with a Poisson's ratio of zero. Then, we prepared a novel shape memory alloy composition of Cu-18at%Al-l0at%Mn-0.3 at%Si, which exhibited excellent printability and adaptability within the laser powder bed fusion additive manufacturing process. Additionally, the printed SMA exhibited superelasticity, one-way and two-way shape memory effect under varying parameters. Furthermore, the combination of multifunctionality into the flexible CuAlMn metamaterials was achieved by manipulating process parameters. Remarkably, the printed metamaterial demonstrates exceptional flexibility deformation, and presents superelasticity or shape memory effect, ensuring the recovery of its original shape after experiencing deformation. This work not only demonstrates the vast potential of utilising additive manufacturing technology for fabricating functional and adaptable metal metamaterials but also presents an innovative approach for creating smart metal metamaterial.

尽管超材料增材制造取得了显着进步，但由于静态配置，功能和机械性能之间仍然存在权衡，这限制了它们的应用，特别是在需要高效多功能的领域。在本文中，我们提出了一种利用激光粉末床熔融技术制造多功能智能柔性金属超材料的新方法。这种方法使可逆恢复超弹性应变超过 20%，恢复率达到 100%，比打印合金中观察到的恢复率高十倍。这是通过利用创新的超材料结构设计和新型形状记忆合金粉末来实现的。为了实现上述目的，超材料晶胞最初被设计为确保泊松比为零的柔性变形能力。然后，我们制备了一种新型形状记忆合金成分Cu-18at%Al-10at%Mn-0.3 at%Si，其在激光粉末床熔融增材制造工艺中表现出优异的可印刷性和适应性。此外，印刷的 SMA 在不同参数下表现出超弹性、单向和双向形状记忆效应。此外，通过操纵工艺参数，将多功能性组合到柔性 CuAlMn 超材料中。值得注意的是，印刷超材料表现出优异的柔性变形，并呈现出超弹性或形状记忆效应，确保在变形后恢复其原始形状。这项工作不仅展示了利用增材制造技术制造功能性和适应性金属超材料的巨大潜力，而且还提出了一种创建智能金属超材料的创新方法。